Photographic-printing apparatus.



A. W. DREYFDOS.

PHOTOGRAPHIC PRINTING APPARATUS.

APPLICATION FILED FEB.9, 1911.

Patented Jan. 28, 1913.

4 SHEETS-SHEET 1.

A. W. DREYFOOS.

PHOTOGRAPHIC PRINTING APPARATUS.

APPLICATION FILED FEB.9, 1911. 1,051,561 Patented Jan. 28, 1913.

4 SHEETS-SHEET 2 I 72126 72 for.

Wz'inesaes qlarmralcf Wfireyfoos cflitorneg A. W. DREYFOOS.

PHOTOGRAPHIG PRINTING APPARATUS.

APPLICATION FILED TEB.9, 1911. 1,051,567. Patented Jan. 28, 1913.

4 SHEETS-SHEET 3.

A. W. DREYFOOS. PHOTOGRAPHIC PRINTING APPARATUS.

APPLICATION FILED FEB.9, 1911. 1,05 1,5 7. Patented Jan. 28, 1913.

4 SHEETS-SHEET 4.

2.9 I gig/ 1111111111111 19 25 Z0 editor nay UNITED STATES PATENT OFFICE.

ALEXANDER W. DREYFOOS, OF MOUNT VERNON, NEW YORK.

PHOTOGRAPHIC-PRINTING KPPARATUS.

To a]! whom it may concern:

Be it known that I, ALEXANDER W. DREY- Foos, a citizen of the United States, and a resident of Mount Vernon, in the county of \VestchesterfState of New York, have invented certain new and useful Improvements in Photographic-Printing Apparatus, of which the following is a full, clear, and exact specification.

My invention relates to improvements in apparatus for photographic printing by artificial light, and consists in the construction and arrangement of parts hereinafter described and pointed out in the claims.

The objects of my invention are to provide an apparatus of the character mentioned with a revoluble shutter, means for adjusting the shutter, and means for automatically controlling the rotationthereof whereby a proper regulation of the printing exposure and distribution of the light may be obtained.

In printing multiple copies from a negative or other printing element, or in making' further reproductions of an old print, it is necessary, in order that the prints be uniform and alike in appearance, that the printing exposure, the distribution and the intensity of the light, be substantially the same for each copy printed.

By means of the nicety of regulation and the standardization afforded by my inventioh, I am enabled to accomplish the objects specified, as well as others not hereinbefore enumerated.

In the accompanying drawings, forming part of this specification Figure 1 is a plan view of my apparatus, partially in section and partially broken; Fig. 2 is a central transverse section in elevation; Fig. 3 is an end view in elevation. partly in section, along the line aa in Fig. 1, showing the controlling mechanism; Fig. 4 is a view in elevation, looking from the front, showing an end of the shutter and the controlling mechanism; Fig. 5 is a plan view in detail of the switch; and Fig. 6 is a detail view of the engaging pin shown in Fig. 1.

Similar characters refer to similar parts throughout the several views.

Having reference to the drawings, (1) denotes the housing of the apparatus the top part of which is arranged to form a printing frame; (2) a cover hinged (at 3) to the frame portion and having an attached spring (4) and a handle lever (5) whereby Specification of Letters Patent.

Application filed February 9, 1911.

Patented Jan. 28, 1913.

Serial No. 607,463.

the cover may be raised or lowered. When the cover is lowered the handle lever and spring serve to press it against the negative and sensitized elementso as to hold them firmly in place on the transparent bed plate (6). A suitable source of artificial light (7) is located within the housing below the printing frame. Between the light and the plate may be interposed, if desired, one or more thicknesses or plates (8) of a suitable translucent material to diffuse the light. In my apparatus I prefer to use an electric vacuum tube lamp (7) longitudinally supported near its ends on blocks (9) and provided with a suitable reflector (10) arranged to throw the light upward on the plate. Fastened to the housing, above. the vacuum tube and parallel thereto, are a pair of opaque screens (11) spaced apart to form an aperture through which the light may pass. This aperture is arranged to be closed by a rotary shutter, as will be hereinafter explained. The screens have overhanging aprons (12) which are bent to conform to the curvature of the circumference of the rotary shutter and serve to prevent a leakage of light when the opening in the shutter is below the planes of the screens. I prefer to make the screens of any suitable material which may be easily bent in form, and to reinforce them with the ribs or angle irons (13). The screens are arranged for lateral adjustment by means of. the fixed screws (14) acting on the movable nuts (15) carried thereon.

The rotary shutter is disposed axially about the vacuum tube. It consists of a hollow cylinder or drum (16) made of any suitable opaquematerial, having a. section of its circumference removed to form an open ing for the emission of light. This opening is approximately equal in length to the length of the bed plate and in width, substantially equal to the distance between the overhanging edges of the screens (11). This cylinder is revolubly borne, near each end, on a series of roller bearings (17) suitably fastenedin the upright supports (18). A slidable closure (19) is provided to partially close or reduce the width of the cylinder opening so as to afford means for varying the duration of the-exposure for any given speed of rotation of the shutter. This closure is held in place against the inner surface of the cylinder by means of retaining members engaging the flanges (20) of the end members of the cylinder. The slidable closure carries a spring-pressed pin (21) which is arranged to engage one of a series of holes (22) formed in one of the transverse edges of the opening of the cylinder to maintain the closure in adjusted position. In practice these holes may be numbered or otherwise designated, so as to serve as guides for the proper positioning of the slidable closure to secure any desired length of exposure.

To rotate the shutter I provide one end of the cylinder with a toothed wheel (23) which meshes with one of the train of gears (24) and is driven by any suitable power, such as an electric motor (25). The gears (24) may be changed to change the speed'of rotation of the shutter so as to obtain a greater variation in the duration of exposure than is afforded by the slidable closure; but it will be understood that these gears may be dispensed with and the speed variations sought obtained by other means.

To control the starting and stopping of the rotation of the shutter I provide a bell crank (26),-pivotally supported in a standard (27) and controlling, through a connecting rod (28), a knife switch (29) which is arranged to make or break the electrical connection of the motor. Normally, when the shutter is at rest, the projection (30) carried at the end of the vertical arm of the bell crank is in engagement with the recess (31) formed in the inner rim of the toothed wheel, and the horizontal arm is raised by the tension spring (32) to open the switch. The recess (31) is located with reference to the aperture in the shutter so that when the oess, I have a depressing rod pivotally suspended from a rocker arm (34) which is actuated by a downward pressure of the handle lever 5 upon the closing of the cover of the printing frame. The rod has :1 lug (35) near its lower end, which rests loosely on a pin (36) carried on the horizontal arm of the bell crank. It will be seen that when the printing elements are in place in the frame, the operation of shutting the cover upon them will automatically start the rotation of the shutter. As the shutter revolves, the bell crank is maintained in position to keep the switch closed by contact of its projection (30) with the inner rim of the toothedwheel. A cam (37) carried on the side of the toothed rim, slightly in advance of therecess, is arranged to engage the bent end (38) of the depressing rod to shift the rod laterally so as to disengage its lug from the pin (36) and hold it out of engagement until the cover is raised. This serves to prevent an involuntary second exposure of the same sensitized elements. Upon the completion of a revolution of the shutter, the projection (30) again enters the recess (31) and the horizontal arm is raised by the spring to open the switch and stop the rotation thereof. \Vhen the cover is raised to remove the print, the depressing rod is released and is drawn upwardly by the spring (39) and laterally by the spring (40) toward the pin (3(3) and into engagement therewith, thus setting the mechanism for a subsequent operation.

In the foregoing specification I have described what I believe to be the best mode of applying my invention, but it will be understood that the construction and arrangement of the various parts may be modified from that illustrated in the accompanying drawing without departing from the spirit of my invention.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is: v

1. In a photographic-printing apparatus, the combination with a printing frame; of a rotary shutter; a source of artificial actinic light arranged in the interior of the shutter; means for rotating the shutter; and means actuated by the rotary movement of said shutter for automatically stopping the rotation thereof upon the completion of one revolution.

. 2. In a photographic-printing apparatus, the combination with a printing frame; of a revoluble cylinder disposed relatively to the frame, said cylinder having a longitudinal aperture for the passage of light formed in its periphery, and a slidable closure for reducing the width of said aperture; a

vacuum are light source inside the cylinder;

means for rotating the cylinder; and means actuated by the rotary movement of said cylinder for automatically stopping the rotation thereof upon the completion of one revolution.

3. In a photographic-printing apparatus, the combination with a printing frame having a movable cover; of a rotary shutter; a vacuum are light source arranged in the interior of the shutter; means for starting the rotation of the shutter, actuated by the closing of the cover upon the frame; and means for automatically stopping the rotation on the completion of one revolution.

4. In a photographic-printing apparatus, the combination with a printing frame of a rotary shutter comprising a hollow opaque cylinder having a section of its periphery removed to form a longitudinal aperture, and a slidable closure secured to said cylinder and adapted to reduce the width of said aperture.

5. In a photographic-printing apparatus,

of a revolution of the shutter; and means for rotating the shutter.

8. In a photographic printing apparatus, a housing comprising a printing frame portion, having a hinged cover; a vacuum tube lamp arranged within the housing; an opaque partition between the lamp and the printing frame, said partition having an aperture for the passage of light; an adjustable rotary shutter disposed axially about the said lamp and arranged to close the apa vacuum tube lamp disposed longitudinally below said frame; a pair of opaque screens disposed above said tube, approximately parallel thereto, and spaced apart to form an aperture for the passage of light; a rotary shutter arrange axially about the vacuum tube lamp, and adapted to close said aperture during a part of one revolution of said shutter; and means for rotating the shutter.

6. In a photographic-printing apparatus,

a printing frame;

a printing frame having a hinged cover; a erture in said partition during a predeterrotary shutter; an electric motor for rotat-' mined part of a revolution of the shutter; ing the shutter; a switch for controlling the means for rotating the shutter; means for motor circuit; means for closing said switch, actuated by the closing of the cover upon the frame; and means for automatically opening the switch upon the completion of a revolution of the shutter.

7 In a photographic printing apparatus, a housing comprising a printing frame; a vacuum tube lamp arranged within the housing; an opaque partition between the lamp and the printing frame, said partition having an aperture for the passage of light; a rotary shutter disposed axially about said lamp and arranged to close the aperture in said partition during a predetermined part controlling the starting of said rotating means, actuated by the closing of the cover upon the frame; and means for automatically controlling the stopping of the rotation of said shutter upon the completion of one revolution thereof.

In testimony whereof I have hereunto aflixed my signature in the presence of two subscribing witnesses.

ALEXANDER W. DREYFOOS.

Witnesses:

MAX B. MARKS, SAM L. DREYFOOS. 

